Working with shaders using lookup data IOS

I have lookup data(256 values) provided by one software and I want to use this data with shader as written below:

7999745,8000001,8000258,8066051,8066308,8132357,8132614,......

Fragment Shader code:

Code:

precision highp float;

 uniform sampler2D inputImageTexture;
 uniform sampler2D inputImageTexture2;
 varying vec2 textureCoordinate;
 uniform float uAmount;

 void main() {
     vec4 color = texture2D(inputImageTexture, textureCoordinate);
     vec2 pos = vec2((color.r + color.g + color.b)/ 3.0, 0.0);
     vec4 dstColor = texture2D(inputImageTexture2, pos);

     gl_FragColor = mix(
                        color,
                        dstColor,
                        uAmount);
 }  

Help me to pass this data to sampler2D inputimageTexture2.
I am thinking that these should converted to rgb(image texture) somehow, so I can pass this to sampler2D.

 

Can you please give me brief idea how can I convert these lookup data to rgb data.
Thank you.

 

Thank you.

Thank you.
I got it that these values are 32 bit integer. I convert 32-bit integer value to RGB value.